Sodium Carbonate → 5-(4-acetylpyridin-3-yl)-3-methylbenzo[d]oxazol-2(3H)-one

HRID 1253927Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1253927
Br[C:2]1[CH:3]=[N:4][CH:5]=[CH:6][C:7]=1[C:8](=[O:10])[CH3:9].[CH3:11][N:12]1[C:16]2[CH:17]=[C:18](B3OC(C)(C)C(C)(C)O3)[CH:19]=[CH:20][C:15]=2[O:14][C:13]1=[O:30].C(=O)([O-])[O-].[Na+].[Na+]>C1(C)C=CC=CC=1.C(O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:8]([C:7]1[CH:6]=[CH:5][N:4]=[CH:3][C:2]=1[C:18]1[CH:19]=[CH:20][C:15]2[O:14][C:13](=[O:30])[N:12]([CH3:11])[C:16]=2[CH:17]=1)(=[O:10])[CH3:9]

Komponenten

7

Edukt 3

HCID 10340Sodium CarbonateHCID 137934561-(3-Bromopyridin-4-yl)ethan-1-oneHCID 595350693-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2(3H)-benzoxazolone

Produkt 1

HCID 498020215-(4-acetylpyridin-3-yl)-3-methylbenzo[d]oxazol-2(3H)-oneAusbeute 55,2 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 178418397HCID 178418397, VerbindungKatalysatorHCID 702EthanolLösungsmittelHCID 1140TolueneLösungsmittel

Reaktionsbedingungen

Temperatur
90 °C

Versuchsvorschrift

A mixture of 1-(3-bromopyridin-4-yl)ethanone (50 mg, 0.250 mmol), 3-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzo[d]oxazol-2(3H)-one (68.8 mg, 0.250 mmol), polymer bound PalladiumTetrakis (56.8 mg, 6.25 μmol) and sodium carbonate (250 μl, 0.500 mmol) in toluene (1 mL) and ethanol (1 mL) was heated to 90° C. in microwave for 45 min. After filtration through a pad of Na2SO4, the solvent was removed in vacuum. The residue was purified by flash column (MeOH—CH2Cl2, v/v, 1%-1.5%) and yielded colorless solid (37 mg). ESI-MS m/z: 269.0 [M+1]+, Retention time 1.03 min; 1H NMR (400.3 MHz, CDCl3): δ 2.13 (s, 3H), 344 (s, 3H), 6.95 (d, J=1.48 Hz, 1H), 7.07 (dd, J=8.2, 1.68 Hz, 1H), 7.29 (d, J=8.2 Hz, 1H), 7.37 (d J=5 Hz, 1H), 8.69 (s, 1H), 8.73 (d, J=5 Hz, 1H).

Aufarbeitung

  1. filtrationAfter filtration through a pad of Na2SO4
  2. customthe solvent was removed in vacuum
  3. customThe residue was purified by flash column (MeOH—CH2Cl2, v/v, 1%-1.5%)

Quellen und Nachweise

ORD-Eintrag
ord-c04d8fb8b23f452095a50db93690123c
Quelldatensatz
uspto-grants-2013_06
Patentnummer
US08455522B2

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